Correct Answer: Option B

Explanation

Molecular mass = vapour density X₂

Mm of XO₂ = x + 16(2) = x + 32

vapour density = 32

∴ x + 32 = 32 × 2

x + 32 = 64

x = 64 - 32

x = 32

∴ the relative molecular mass of X is 32
Relative molecular mass = vapour density × 2

There is an explanation video available below.

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